Issue 27, 2012
From the journal:

Journal of Materials Chemistry

A novel composite film for detection and molecular weight determination of organic vapors†

Bishnu P. Regmi,a   Joshua Monk,b   Bilal El-Zahab,a   Susmita Das,a   Francisco R. Hung,b   Daniel J. Hayes*c  and  Isiah M. Warner*a  

* Corresponding authors

a Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA
E-mail: iwarner@lsu.edu
Fax: +1 225-578-3971
Tel: +1 225-578-2829

b Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA

c Department of Biological and Agricultural Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
E-mail: danielhayes@lsu.edu

Abstract

A novel vapor-sensitive composite film comprising cellulose acetate and a representative compound (1-n-butyl-2,3-dimethylimidazolium hexafluorophosphate) from a Group of Uniform Materials Based on Organic Salts (GUMBOS) has been developed and characterized. The vapor sensing characteristics of the film is investigated using a quartz crystal microbalance (QCM) transducer. The material exhibited greatly improved performance characteristics toward a number of organic vapors. It is demonstrated that the ratio of the change in resonance frequency (Δf) to the change in motional resistance (ΔR) is a concentration-independent quantity proportional to the molecular weight of the absorbed chemical species. To the best of our knowledge, this is the first study to show a direct relationship between Δf/ΔR and the molecular weight of analytes. This unique finding should prove extremely useful for easy identification and molecular weight determination of a broad range of chemical vapors.

Graphical abstract: A novel composite film for detection and molecular weight determination of organic vapors

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Article information

DOI
https://doi.org/10.1039/C2JM31623D
Article type
Paper
Submitted
15 Mar 2012
Accepted
29 May 2012
First published
30 May 2012

J. Mater. Chem., 2012,22, 13732-13741

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A novel composite film for detection and molecular weight determination of organic vapors

B. P. Regmi, J. Monk, B. El-Zahab, S. Das, F. R. Hung, D. J. Hayes and I. M. Warner, J. Mater. Chem., 2012, 22, 13732 DOI: 10.1039/C2JM31623D

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